Natural diet of Macrobrachium brasiliense (Crustacea, Decapoda) in a Cerrado stream

IF 0.5 4区生物学 Q4 ZOOLOGY Iheringia Serie Zoologia Pub Date : 2021-01-01 DOI:10.1590/1678-4766E2021003

Barbara R. F. da Cruz, M. C. Cunha, A. Bueno, G. B. Jacobucci

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引用次数: 4

Abstract

ABSTRACT Knowledge about the diet of a given species is essential to provide information on the growth and maintenance of populations in a natural environment. Macrobrachium brasiliense (Heller, 1862) is a species of freshwater prawn widely distributed in Brazil, being frequent in aquatic environments inserted in the Cerrado biome. The aim of this study was to evaluate the natural diet of a population of M. brasiliense, comparing the consumed food items according to sex, seasonality and body size of individuals. Monthly collections were carried out between September 2018 and August 2019. The individuals collected had their sex identified and the length of the cephalothorax measured. Stomach content was assessed based on the degree of repletion, the method of points and the frequency of occurrence. There was a high frequency of plant material in the stomach contents and a smaller but significant frequency of aquatic insects. There were no significant differences regarding the diet of males and females and between the dry and rainy seasons. It was observed an increase in total insect consumption with the increase in size of males and females of M. brasiliense. A diet preference for Trichoptera was recorded in both sampling periods for males and females. The results obtained confirm an omnivorous diet for the species and suggest that the composition and proportion of items may vary depending on the size of the individuals and the availability of the items in the environment.

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塞拉多河中巴西沼虾(甲壳纲，十足纲)的天然饮食

了解特定物种的饮食对于提供种群在自然环境中生长和维持的信息至关重要。巴西巨臂虾(Macrobrachium brasiliense, Heller, 1862)是一种在巴西广泛分布的淡水对虾，在塞拉多生物群系中插入的水生环境中频繁出现。本研究的目的是评估巴西螺种群的自然饮食，根据个体的性别、季节和体型对所消耗的食物进行比较。每月收集于2018年9月至2019年8月进行。收集到的个体进行了性别鉴定，并测量了头胸的长度。胃内容物以充盈程度、积分法和出现频率为评价依据。胃内容物中植物物质的频率较高，水生昆虫的频率较小，但也很显著。雄性和雌性以及旱季和雨季之间的饮食没有显著差异。结果表明，巴西螺的总食虫量随雌雄体大小的增加而增加。在两个采样期间，记录了雄性和雌性毛翅目昆虫的饮食偏好。结果证实了该物种的杂食性饮食，并表明食物的组成和比例可能根据个体的大小和环境中食物的可用性而变化。

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来源期刊

Iheringia Serie Zoologia 生物-动物学

CiteScore

1.00

自引率

0.00%

发文量

审稿时长

6-12 weeks

期刊介绍： The journal Iheringia, Série Zoologia, edited by the “Museu de Ciências Naturais” of the “Fundação Zoobotânica do Rio Grande do Sul”, publishes original research findings in zoology with emphasis on taxonomy, systematics, morphology, natural history, and community or population ecology of species from current Neotropical fauna. Scientific notes will not be accepted for publication. Species lists without a taxonomic approach, or that are not the result of studies on the ecology or natural history of communities will not normally be accepted. The same applies to identification keys of groups of taxa defined by political boundaries. Authors wishing to inquire about the scope of the journal or the suitability of a particular topic are encouraged to contact the Editorial Board prior to submission. Furthermore, articles with a main focus on agronomy, veterinary, zootechny or other areas involving applied zoology will not be accepted. Its abbreviated title is Iheringia, Sér. Zool., which should be used in bibliographies, footnotes and bibliographical references and strips.